EP4094981B1 - Headrest for a motor vehicle seat - Google Patents

Headrest for a motor vehicle seat Download PDF

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Publication number
EP4094981B1
EP4094981B1 EP22175246.2A EP22175246A EP4094981B1 EP 4094981 B1 EP4094981 B1 EP 4094981B1 EP 22175246 A EP22175246 A EP 22175246A EP 4094981 B1 EP4094981 B1 EP 4094981B1
Authority
EP
European Patent Office
Prior art keywords
crosspiece
locking
main body
latch
unlocking
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP22175246.2A
Other languages
German (de)
French (fr)
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EP4094981A1 (en
Inventor
Steve LEFEVRE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tesca France SAS
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Tesca France SAS
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Publication date
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Publication of EP4094981A1 publication Critical patent/EP4094981A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/80—Head-rests
    • B60N2/806—Head-rests movable or adjustable
    • B60N2/809—Head-rests movable or adjustable vertically slidable
    • B60N2/812—Head-rests movable or adjustable vertically slidable characterised by their locking devices
    • B60N2/815—Release mechanisms, e.g. buttons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/80—Head-rests
    • B60N2/806—Head-rests movable or adjustable
    • B60N2/809—Head-rests movable or adjustable vertically slidable
    • B60N2/812—Head-rests movable or adjustable vertically slidable characterised by their locking devices
    • B60N2/818—Head-rests movable or adjustable vertically slidable characterised by their locking devices with stepwise positioning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/80—Head-rests
    • B60N2/806—Head-rests movable or adjustable
    • B60N2/865—Head-rests movable or adjustable providing a fore-and-aft movement with respect to the occupant's head
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/80—Head-rests
    • B60N2/894—Head-rests with rods solidly attached to the back-rest

Definitions

  • the invention relates to a motor vehicle seat headrest.
  • the locking of the secondary body may prove to be insufficiently robust in the event of a violent impact of a passenger's head on the headrest, which may prove dangerous.
  • the invention aims to overcome these drawbacks.
  • the locking of the secondary body has great robustness due to the presence of the locking edge of the latch in the locking position, said edge preventing unwanted removal of said latch from the rack.
  • the crosspiece 7 has a trunk 16 and a branch 17 extending parallel to said trunk, the cam 9 being housed between said trunk and said branch so as to be held longitudinally, said cam having at least one - in particular two according to the embodiment shown - second finger 18 forming point 10 of connection in rotation to said crosspiece, said finger inserting into a notch 19 provided at the free end of said branch so that the actuation of said crosspiece in unlocking induces a thrust of said crosspiece on said finger.
  • the unlocking position of the latch 5 is located above its locking position.
  • the rack 6 is arranged on a guide member 20 sliding the secondary body 4 on the main body 3, said member being in particular in the form of a tenon integrated into said secondary body, said tenon sliding in a mortise provided in said main body.
  • the two rods 2 are notched, the locking projections 22 coming from a spring-loaded metal wire whose end parts are folded so as to form said projections, the actuation of said unlocking crosspiece operating a pressing on said parts to deform said wire and release said projections from the locking notches 21.
  • the spring means for returning the crosspiece 7 to the locking position can be formed solely by the spring-loaded metal wire, said wire returning to the undeformed state when said crosspiece is not activated to unlock.

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Seats For Vehicles (AREA)

Description

L'invention concerne un appui-tête de siège de véhicule automobile.The invention relates to a motor vehicle seat headrest.

Il est connu, par exemple selon le document EP 3 153 347 A1 ou le document EP 3 616 984 A1 , de réaliser un appui-tête de siège de véhicule automobile, ledit appui-tête comprenant :

  • une armature de montage sur un dossier dudit siège, ladite armature comprenant deux tiges parallèles s'étendant verticalement,
  • un corps principal monté en coulissement sur lesdites tiges de manière à pouvoir adopter une pluralité de positions de réglage vertical,
  • un premier dispositif de verrouillage dudit corps principal dans la position de réglage choisie,
  • un corps secondaire monté en coulissement longitudinal sur ledit corps principal, de sorte que ledit corps secondaire puisse adopter une pluralité de positions de réglage longitudinal,
  • un deuxième dispositif de verrouillage dudit corps secondaire dans la position de réglage choisie, ledit dispositif comprenant un loquet monté en coulissement vertical sur ledit corps principal entre une position de verrouillage, où il coopère avec une crémaillère s'étendant longitudinalement sur ledit corps secondaire, et une position de déverrouillage, où il s'écarte de ladite crémaillère pour libérer le coulissement dudit corps secondaire,
  • une traverse de déverrouillage simultané desdits dispositifs, ladite traverse étant montée en coulissement transversal sur ledit corps principal, ladite traverse présentant une extrémité pourvue d'un bouton permettant son actionnement en translation vers une position de déverrouillage, de manière à libérer le coulissement desdits corps principal et secondaire,
  • un moyen ressort de renvoi de ladite traverse en position de verrouillage.
It is known, for example according to the document EP 3 153 347 A1 or the document EP 3 616 984 A1 , to produce a headrest for a motor vehicle seat, said headrest comprising:
  • a mounting frame on a backrest of said seat, said frame comprising two parallel rods extending vertically,
  • a main body slidably mounted on said rods so as to be able to adopt a plurality of vertical adjustment positions,
  • a first device for locking said main body in the chosen adjustment position,
  • a secondary body mounted in longitudinal sliding on said main body, so that said secondary body can adopt a plurality of longitudinal adjustment positions,
  • a second device for locking said secondary body in the chosen adjustment position, said device comprising a latch mounted in vertical sliding on said main body between a locking position, where it cooperates with a rack extending longitudinally on said secondary body, and an unlocking position, where it moves away from said rack to release the sliding of said secondary body,
  • a crosspiece for simultaneously unlocking said devices, said crosspiece being mounted in transverse sliding on said main body, said crosspiece having one end provided with a button allowing its actuation in translation towards an unlocking position, so as to release the sliding of said main body and secondary,
  • spring means for returning said crosspiece to the locking position.

Les agencements connus présentent généralement une certaine complexité, liée notamment à l'utilisation de composants multiples, mettant par exemple en oeuvre un ressort de renvoi du loquet en position de verrouillage, la présence dudit ressort induisant en outre la nécessité de déployer un effort additionnel pour réaliser le déverrouillage des dispositifs de verrouillage.Known arrangements generally present a certain complexity, linked in particular to the use of multiple components, for example using a spring for returning the latch to the locking position, the presence of said spring also inducing the need to deploy additional effort to unlock the locking devices.

En outre, le verrouillage du corps secondaire peut s'avérer de robustesse insuffisante en cas de choc violent d'une tête de passager sur l'appui-tête, ce qui peut s'avérer dangereux.In addition, the locking of the secondary body may prove to be insufficiently robust in the event of a violent impact of a passenger's head on the headrest, which may prove dangerous.

L'invention a pour but de pallier ces inconvénients.The invention aims to overcome these drawbacks.

A cet effet, l'invention propose un appui-tête de siège de véhicule automobile,

  • ledit appui-tête comprenant :
    • une armature de montage sur un dossier dudit siège, ladite armature comprenant deux tiges parallèles s'étendant verticalement,
    • un corps principal monté en coulissement sur lesdites tiges de manière à pouvoir adopter une pluralité de positions de réglage vertical,
    • un premier dispositif de verrouillage dudit corps principal dans la position de réglage choisie,
    • un corps secondaire monté en coulissement longitudinal sur ledit corps principal, de sorte que ledit corps secondaire puisse adopter une pluralité de positions de réglage longitudinal,
    • un deuxième dispositif de verrouillage dudit corps secondaire dans la position de réglage choisie, ledit dispositif comprenant un loquet monté en coulissement vertical sur ledit corps principal entre une position de verrouillage, où il coopère avec une crémaillère s'étendant longitudinalement sur ledit corps secondaire, et une position de déverrouillage, où il s'écarte de ladite crémaillère pour libérer le coulissement dudit corps secondaire,
    • une traverse de déverrouillage simultané desdits dispositifs, ladite traverse étant montée en coulissement transversal sur ledit corps principal, ladite traverse présentant une extrémité pourvue d'un bouton permettant son actionnement en translation vers une position de déverrouillage, de manière à libérer le coulissement desdits corps principal et secondaire,
    • un moyen ressort de renvoi de ladite traverse en position de verrouillage,
  • ledit appui-tête comprenant en outre une came de renvoi d'effort disposée entre ladite traverse et ledit loquet, ladite came présentant en vue longitudinale :
    • un point de liaison en rotation à ladite traverse selon un axe longitudinal de rotation,
    • et, latéralement de part et d'autre dudit point :
      • o d'une part un premier doigt monté en coulissement dans une fente de guidage prévue dans ledit corps principal et un bord de blocage dudit loquet en position de verrouillage,
      • o et d'autre part un bord d'actionnement formant surface de came prenant appui sur ledit loquet,
  • ladite fente étant agencée de manière à induire, lors du déplacement de ladite traverse en déverrouillage et du déplacement transversal dudit point qui en résulte :
    • un déplacement dudit bord de blocage libérant l'actionnement dudit loquet en déverrouillage,
    • et une mise en rotation de ladite came autour dudit axe, ladite rotation réalisant un déplacement vertical dudit bord d'actionnement repoussant ledit loquet vers sa position de déverrouillage.
For this purpose, the invention proposes a motor vehicle seat headrest,
  • said headrest comprising:
    • a mounting frame on a backrest of said seat, said frame comprising two parallel rods extending vertically,
    • a main body slidably mounted on said rods so as to be able to adopt a plurality of vertical adjustment positions,
    • a first device for locking said main body in the chosen adjustment position,
    • a secondary body mounted in longitudinal sliding on said main body, so that said secondary body can adopt a plurality of longitudinal adjustment positions,
    • a second device for locking said secondary body in the chosen adjustment position, said device comprising a latch mounted in vertical sliding on said main body between a locking position, where it cooperates with a rack extending longitudinally on said secondary body, and a position of unlocking, where it moves away from said rack to release the sliding of said secondary body,
    • a crosspiece for simultaneously unlocking said devices, said crosspiece being mounted in transverse sliding on said main body, said crosspiece having one end provided with a button allowing its actuation in translation towards an unlocking position, so as to release the sliding of said main body and secondary,
    • a spring means for returning said crosspiece to the locking position,
  • said headrest further comprising a force return cam disposed between said crosspiece and said latch, said cam presenting in longitudinal view:
    • a point of connection in rotation to said crosspiece along a longitudinal axis of rotation,
    • and, laterally on either side of said point:
      • o on the one hand a first finger slidably mounted in a guide slot provided in said main body and a locking edge of said latch in the locking position,
      • o and on the other hand an actuation edge forming a cam surface bearing on said latch,
  • said slot being arranged so as to induce, during the movement of said unlocking crosspiece and the resulting transverse movement of said point:
    • a movement of said locking edge releasing the actuation of said unlocking latch,
    • and rotating said cam around said axis, said rotation effecting a vertical movement of said actuating edge pushing said latch towards its unlocking position.

Dans cette description, les termes de positionnement dans l'espace (longitudinal, transversal, latéral, vertical, dessus, ...) sont pris en référence à l'appui-tête disposé dans le véhicule en situation d'utilisation.In this description, the terms of positioning in space (longitudinal, transverse, lateral, vertical, top, etc.) are taken with reference to the headrest placed in the vehicle in use.

Avec l'agencement proposé, on simplifie ce qui était connu de l'art antérieur, notamment en supprimant le ressort de renvoi du loquet en position de verrouillage, la suppression dudit ressort induisant une diminution de l'effort à appliquer pour réaliser le déverrouillage des dispositifs de verrouillage.With the proposed arrangement, what was known from the prior art is simplified, in particular by removing the spring returning the latch to the locking position, the removal of said spring inducing a reduction in the effort to be applied to unlock the locking devices.

En outre le verrouillage du corps secondaire présente une grande robustesse de par la présence du bord de blocage du loquet en position de verrouillage, ledit bord empêchant un retrait non voulu dudit loquet de la crémaillère.Furthermore, the locking of the secondary body has great robustness due to the presence of the locking edge of the latch in the locking position, said edge preventing unwanted removal of said latch from the rack.

D'autres particularités et avantages de l'invention apparaîtront dans la description qui suit, faite en référence aux figures jointes, dans lesquelles :

  • [Fig.1] est une vue schématique partielle, selon une direction longitudinale, d'un appui-tête selon une réalisation, la traverse étant en position de verrouillage,
  • [Fig.2a] et
  • [Fig.2b] sont des vues de détail correspondant à la figure 1, la traverse étant en position de verrouillage (figure 2a) et de déverrouillage (figure 2b),
  • [Fig.3] est une vue schématique partielle, selon une direction transversale, de l'appui-tête des figures précédentes, le loquet étant en position de verrouillage, [Fig.4a] et
  • [Fig.4b] sont des vues de détail correspondant à la figure 3, le loquet étant en position de verrouillage (figure 4a) et de déverrouillage (figure 4b),
  • [Fig.5a] et
  • [Fig.5b] sont des vues schématiques partielles en coupe horizontale de l'appui-tête des figures précédentes, la traverse étant en position de verrouillage (figure 5a) et de déverrouillage (figure 5b),
  • [Fig.6a] et
  • [Fig.6b] sont des vues schématiques partielles en perspective éclatée (figure 6a) et non éclatée (figure 6b) de l'appui-tête des figures précédentes,
  • [Fig.7] est une vue en perspective partielle de l'appui-tête de figures précédentes, le loquet étant en position de verrouillage.
Other particularities and advantages of the invention will appear in the description which follows, made with reference to the attached figures, in which:
  • [ Fig.1 ] is a partial schematic view, in a longitudinal direction, of a headrest according to one embodiment, the crosspiece being in the locking position,
  • [ Fig.2a ] And
  • [ Fig.2b ] are detailed views corresponding to the figure 1 , the crosspiece being in the locked position ( figure 2a ) and unlocking ( figure 2b ),
  • [ Fig.3 ] is a partial schematic view, in a transverse direction, of the headrest of the preceding figures, the latch being in the locking position, [ Fig.4a ] And
  • [ Fig.4b ] are detailed views corresponding to the Figure 3 , the latch being in the locking position ( figure 4a ) and unlocking ( figure 4b ),
  • [ Fig.5a ] And
  • [ Fig.5b ] are partial schematic views in horizontal section of the headrest of the preceding figures, the crosspiece being in the locking position ( figure 5a ) and unlocking ( figure 5b ),
  • [ Fig.6a ] And
  • [ Fig.6b ] are partial schematic views in exploded perspective ( figure 6a ) and not exploded ( figure 6b ) of the headrest of the previous figures,
  • [ Fig.7 ] is a partial perspective view of the headrest of previous figures, the latch being in the locking position.

En référence aux figures, on décrit un appui-tête 1 de siège de véhicule automobile, ledit appui-tête comprenant :

  • une armature de montage sur un dossier dudit siège, ladite armature comprenant deux tiges 2 parallèles s'étendant verticalement,
  • un corps principal 3 - notamment en matériau plastique moulé - monté en coulissement sur lesdites tiges de manière à pouvoir adopter une pluralité de positions de réglage vertical,
  • un premier dispositif de verrouillage dudit corps principal dans la position de réglage choisie,
  • un corps secondaire 4 - notamment en matériau plastique moulé - monté en coulissement longitudinal sur ledit corps principal, de sorte que ledit corps secondaire puisse adopter une pluralité de positions de réglage longitudinal,
  • un deuxième dispositif de verrouillage dudit corps secondaire dans la position de réglage choisie, ledit dispositif comprenant un loquet 5 monté en coulissement vertical sur ledit corps principal entre une position de verrouillage, où il coopère avec une crémaillère 6 s'étendant longitudinalement sur ledit corps secondaire, et une position de déverrouillage, où il s'écarte de ladite crémaillère pour libérer le coulissement dudit corps secondaire,
  • une traverse 7 de déverrouillage simultané desdits dispositifs, ladite traverse étant montée en coulissement transversal sur ledit corps principal, ladite traverse présentant une extrémité 8 pourvue d'un bouton - notamment sous forme de bouton poussoir ou de bouton rotatif non représentés - permettant son actionnement en translation vers une position de déverrouillage, de manière à libérer le coulissement desdits corps principal et secondaire,
  • un moyen ressort de renvoi de ladite traverse en position de verrouillage,
  • ledit appui-tête comprenant en outre une came 9 de renvoi d'effort disposée entre ladite traverse et ledit loquet, ladite came présentant en vue longitudinale :
    • un point 10 de liaison en rotation à ladite traverse selon un axe 11 longitudinal de rotation,
    • et, latéralement de part et d'autre dudit point :
      • o d'une part un - deux selon la réalisation représentée - premier doigt 12 monté en coulissement dans une - deux selon la réalisation représentée - fente 13 de guidage prévue dans ledit corps principal et un bord de blocage 14 dudit loquet en position de verrouillage,
      • o et d'autre part un bord d'actionnement 15 formant surface de came prenant appui sur ledit loquet,
  • ladite fente étant agencée de manière à induire, lors du déplacement de ladite traverse en déverrouillage et du déplacement transversal dudit point qui en résulte :
    • un déplacement dudit bord de blocage libérant l'actionnement dudit loquet en déverrouillage,
    • et une mise en rotation de ladite came autour dudit axe, ladite rotation réalisant un déplacement vertical dudit bord d'actionnement repoussant ledit loquet vers sa position de déverrouillage.
With reference to the figures, a headrest 1 of a motor vehicle seat is described, said headrest comprising:
  • a mounting frame on a backrest of said seat, said frame comprising two parallel rods 2 extending vertically,
  • a main body 3 - in particular made of molded plastic material - slidably mounted on said rods so as to be able to adopt a plurality of vertical adjustment positions,
  • a first device for locking said main body in the chosen adjustment position,
  • a secondary body 4 - in particular made of molded plastic material - mounted in longitudinal sliding on said main body, so that said secondary body can adopt a plurality of longitudinal adjustment positions,
  • a second device for locking said secondary body in the chosen adjustment position, said device comprising a latch 5 mounted in vertical sliding on said main body between a locking position, where it cooperates with a rack 6 extending longitudinally on said secondary body , and an unlocking position, where it moves away from said rack to release the sliding of said secondary body,
  • a crosspiece 7 for simultaneously unlocking said devices, said crosspiece being mounted in transverse sliding on said main body, said crosspiece having an end 8 provided with a button - in particular in the form of a push button or rotary button not shown - allowing its actuation in translation towards an unlocking position, so as to release the sliding of said main and secondary body,
  • a spring means for returning said crosspiece to the locking position,
  • said headrest further comprising a force return cam 9 disposed between said crosspiece and said latch, said cam presenting in longitudinal view:
    • a point 10 of connection in rotation to said crosspiece along a longitudinal axis 11 of rotation,
    • and, laterally on either side of said point:
      • o on the one hand one - two according to the embodiment shown - first finger 12 slidably mounted in one - two according to the embodiment shown - guide slot 13 provided in said main body and a locking edge 14 of said latch in the locking position,
      • o and on the other hand an actuation edge 15 forming a cam surface bearing on said latch,
  • said slot being arranged so as to induce, during the movement of said unlocking crosspiece and the resulting transverse movement of said point:
    • a movement of said locking edge releasing the actuation of said unlocking latch,
    • and rotating said cam around said axis, said rotation effecting a vertical movement of said actuating edge pushing said latch towards its unlocking position.

Selon la réalisation représentée, la traverse 7 présente un tronc 16 et une branche 17 s'étendant parallèlement audit tronc, la came 9 étant logée entre ledit tronc et ladite branche de manière à être maintenue longitudinalement, ladite came présentant au moins un - notamment deux selon la réalisation représentée - deuxième doigt 18 formant point 10 de liaison en rotation à ladite traverse, ledit doigt s'insérant dans une encoche 19 prévue en extrémité libre de ladite branche de sorte que l'actionnement de ladite traverse en déverrouillage induise une poussée de ladite traverse sur ledit doigt.According to the embodiment shown, the crosspiece 7 has a trunk 16 and a branch 17 extending parallel to said trunk, the cam 9 being housed between said trunk and said branch so as to be held longitudinally, said cam having at least one - in particular two according to the embodiment shown - second finger 18 forming point 10 of connection in rotation to said crosspiece, said finger inserting into a notch 19 provided at the free end of said branch so that the actuation of said crosspiece in unlocking induces a thrust of said crosspiece on said finger.

Selon la réalisation représentée, la position de déverrouillage du loquet 5 est située au-dessus de sa position de verrouillage.According to the embodiment shown, the unlocking position of the latch 5 is located above its locking position.

Selon la réalisation représentée, la crémaillère 6 est disposée sur un organe de guidage 20 en coulissement du corps secondaire 4 sur le corps principal 3, ledit organe étant notamment sous forme de tenon intégré audit corps secondaire, ledit tenon coulissant dans une mortaise prévue dans ledit corps principal.According to the embodiment shown, the rack 6 is arranged on a guide member 20 sliding the secondary body 4 on the main body 3, said member being in particular in the form of a tenon integrated into said secondary body, said tenon sliding in a mortise provided in said main body.

Selon la réalisation représentée, le premier dispositif de verrouillage comprend :

  • une pluralité de crans 21 de verrouillage s'étageant verticalement sur au moins une des tiges 2 de manière à définir une tige crantée,
  • au moins une saillie 22 de verrouillage montée mobile par rapport au corps principal 3 entre une position de verrouillage, où ladite saillie s'insère dans un desdits crans, et une position de déverrouillage, où ladite saillie se retire dudit cran afin de libérer le coulissement dudit corps.
According to the embodiment shown, the first locking device comprises:
  • a plurality of locking notches 21 arranged vertically on at least one of the rods 2 so as to define a notched rod,
  • at least one locking projection 22 mounted movably relative to the main body 3 between a locking position, where said projection is inserted into one of said notches, and an unlocking position, where said projection withdraws from said notch in order to release the sliding of said body.

Selon la réalisation représentée, les deux tiges 2 sont crantées, les saillies 22 de verrouillage étant issues d'un fil en métal à ressort dont les parties extrêmes sont repliées de manière à former lesdites saillies, l'actionnement de ladite traverse en déverrouillage opérant un appui sur lesdites parties pour déformer ledit fil et dégager lesdites saillies des crans 21 de verrouillage.According to the embodiment shown, the two rods 2 are notched, the locking projections 22 coming from a spring-loaded metal wire whose end parts are folded so as to form said projections, the actuation of said unlocking crosspiece operating a pressing on said parts to deform said wire and release said projections from the locking notches 21.

Dans une telle réalisation, le moyen ressort de renvoi de la traverse 7 en position de verrouillage peut être uniquement formé par le fil en métal à ressort, ledit fil retournant à l'état non déformé quand ladite traverse n'est pas actionnée en déverrouillage.In such an embodiment, the spring means for returning the crosspiece 7 to the locking position can be formed solely by the spring-loaded metal wire, said wire returning to the undeformed state when said crosspiece is not activated to unlock.

Claims (5)

  1. Headrest (1) for a motor vehicle seat, said headrest comprising:
    • a frame for mounting on a backrest of said seat, said frame comprising two parallel vertically extending rods (2),
    • a main body (3) slidably mounted on said rods so as to be able to adopt a plurality of vertical adjustment positions,
    • a first device for locking said main body in the selected adjustment position,
    • a secondary body (4) longitudinally slidably mounted on said main body, so that said secondary body can adopt a plurality of longitudinal adjustment positions,
    • a second device for locking said secondary body in the selected adjustment position, said device comprising a latch (5) mounted for vertical sliding on said main body between a locking position, in which it cooperates with a rack (6) extending longitudinally on said secondary body, and an unlocking position, in which it moves away from said rack to release sliding of said secondary body,
    • a crosspiece (7) for simultaneous unlocking of said devices, said crosspiece being transversely slidably mounted on said main body, said crosspiece having an end (8) provided with a knob enabling it to be actuated in translation towards an unlocking position, so as to free sliding of said main and secondary bodies,
    • spring means for returning the crosspiece to the locked position,
    said headrest being characterized in that it further comprises a force return cam (9) arranged between said crosspiece and said latch, said cam presenting in longitudinal view :
    • a point (10) of rotational connection to said crosspiece along a longitudinal axis (11) of rotation,
    • and, laterally on either side of said point:
    o on the one hand, a first finger (12) slidably mounted in a guide slot (13) provided in said main body and a locking edge (14) of said latch in locking position,
    o and secondly an actuating edge (15) forming a cam surface bearing on said latch,
    said slot being arranged in such a way as to induce, during the displacement of said crosspiece in unlocking and the resulting transverse displacement of said point:
    • a displacement of said locking edge releasing actuation of said latch in unlocking mode,
    • and rotation of said cam about said axis, said rotation effecting a vertical displacement of said actuating edge pushing said latch towards its unlocked position.
  2. Headrest according to claim 1, characterized in that the crosspiece (7) has a trunk (16) and a branch (17) extending parallel to said trunk, the cam (9) being housed between said trunk and said branch so as to be held longitudinally, the said cam having at least one second finger (18) forming a point (10) of connection in rotation with the said crosspiece, the said finger fitting into a notch (19) provided at the free end of the said branch so that actuation of the said crosspiece in unlocking mode induces a thrust of the said crosspiece on the said finger.
  3. Headrest according to one of the preceding claims, characterized in that the unlocked position of the latch (5) is located above its locked position.
  4. Headrest according to any of the preceding claims, characterized in that the rack (6) is arranged on a guide member (20) for sliding the secondary body (4) on the main body (3).
  5. Headrest according to any of the preceding claims, characterized in that the first locking device comprises :
    • a plurality of locking notches (21) vertically stepped on at least one of the rods (2) to define a toothed rod,
    • at least one locking projection (22) mounted so as to be movable relative to the main body (3) between a locking position, in which said projection engages in one of said notches, and an unlocking position, in which said projection withdraws from said notch in order to release sliding of said body.
EP22175246.2A 2021-05-27 2022-05-24 Headrest for a motor vehicle seat Active EP4094981B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2105544A FR3123272B1 (en) 2021-05-27 2021-05-27 Motor vehicle seat headrest

Publications (2)

Publication Number Publication Date
EP4094981A1 EP4094981A1 (en) 2022-11-30
EP4094981B1 true EP4094981B1 (en) 2024-04-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP22175246.2A Active EP4094981B1 (en) 2021-05-27 2022-05-24 Headrest for a motor vehicle seat

Country Status (2)

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EP (1) EP4094981B1 (en)
FR (1) FR3123272B1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104002714B (en) * 2014-06-03 2016-06-29 上海延锋江森座椅有限公司 A kind of novel four-way headrest
DE102018214952B3 (en) * 2018-09-03 2019-08-14 Magna Seating (Germany) Gmbh Adjustable headrest assembly for a motor vehicle seat

Also Published As

Publication number Publication date
FR3123272B1 (en) 2023-06-23
FR3123272A1 (en) 2022-12-02
EP4094981A1 (en) 2022-11-30

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